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The Phototactic Response and Spectral Sensitivity of Chroiviadorina Viridis (Nematoda, Chromadorida) With a Note On the Nature of the Paired Pigment Spots

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Chromadorina viridis (Linstow), a free-living freshwater species, is one of the few nematodes with paired anteriorly situated pigment spots, known as 'ocelli'. This connotation implies a photoreceptive function. However, no behavioural or physiological studies have ever been carried out to establish the presence of a light sense. This paper describes the directional response of C. viridis to light showing a positive phototaxis at most visible wavelengths of light and a negative phototaxis in the near U.V. Using a range of solvents the chemical nature of the spots was investigated, and together with Pickworth's Benzidene test the postulation that the spots are a haemoglobin derivative is made.

Affiliations: 1: Department of Zoology, Imperial College, London University, England


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